1
919
s
QBM4000-..., QBM4100-1U
Differential pressure
sensor
QBM4100-1D
QBM4000...
QBM4100...
For air and non-aggressive gases, with calibration certificate.
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•
•
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•
•
Calibration certificate from the factory
High degree of measuring accuracy
Pressure-linear characteristic curve
Operating voltage AC 24 V / DC 13.5...33 V or DC 11….33 V
Output signal DC 0...10 V or 4…20 mA
Simple and fast mounting thanks to integrated fixing angle bar in the housing
Calibrated and temperature-compensated measuring signal
Excellent long-term response
Supplied with connection set
Very short reaction time
Display* indicates the present differential pressure
•
•
•
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* Depending on type
Use
The differential pressure sensor acquires differential, over and under pressure of
air and nonaggressive gases if a high degree of measuring accuracy and quality is
required as well as a requirement for a calibration certificate.
Fields of application:
•
•
•
•
•
CE1N1919en01
2014-07-30
Measuring slightest differential pressures in ventilation and air conditioning ducts
Check air flows
Monitor filters and control fans
Pressure supervision in labs, production, storage and clean rooms
For acquiring variable air flow in VAV plants on the supply and extract air side
Building Technologies
Type summary
Type (ASN)
Product number
(SSN)
Measuring range
QBM4000-1
QBM4000-3
QBM4000-10
QBM4000-25
QBM4100-1U
S55720-S247
S55720-S248
S55720-S249
S55720-S250
S55720-S251
0 ... 100 Pa
0 ... 300 Pa
0 ...1000 Pa
0 ...2500 Pa
– 50 ... + 50 Pa
DC 0 ... 10 V
DC 0 ... 10 V
DC 0 ... 10 V
DC 0 ... 10 V
4 ... 20 mA
No
No
No
No
No
S55720-S252
0 ... 100 Pa
4 ... 20 mA
Yes
QBM4100-1D
1
1
Output signal
LCD indication
Type with digital display.
Conversion
100 Pa = 1 hPa = 1 mbar
Ordering and delivery
When ordering a differential pressure sensor, please specify the quantity, type, and
product name.
Example
Type (ASN)
Product number (SSN)
Product designation
QBM4000-1
S55720-S247
Differential pressure sensor with calibration certificate.
A round plug connector (Lumberg RKC 30/11) and a 2-meter PVC tube is included
with the differential pressure sensor.
Additional accessories may be ordered separately.
Accessories
Additional sets of air duct probes are available depending on measuring requirements. Various mounting brackets are also available depending on installation
location.
Type
Name
Data sheet
AQB2000
Mounting bracket, for mounting sensors in isolated
air ducts.
N1590
AQB21.2
Top hat rail adapters (5 pieces) for DIN top hat rails,
HT 35-7.5
N1590
FK-PZ1
Air duct probe, short, stainless steel, with elastic
lead-through for simple, quick, and airtight mounting.
N1589
FK-PZ2
Air duct probe, long, aluminum, with orifice plates
for precise measuring requirements.
N1589
Mode of operation
The sensor acquires the differential pressure using a silicon rubber membrane and
ceramic bar. The sensor generates as per the deflection, a linear and temperaturecompensated output signal DC 0...10 V or 4...20 mA.
2/6
Siemens
Building Technologies
Differential pressure sensor QBM4000…/ QBM4100…
CE1N1919en01
2014-07-30
Design
The differential pressure sensors consist of:
• Sensor housing with fixing angle bar, 3-pin plug and hinged lid with sealed safety
screw
• Pressure chamber with membrane and ceramic lever
• Circuit board
• LCD display for the digital display of the sensor signal in Pa (for QBM41…D only)
1919Z 01
Display, setting, and
connection elements
1
Key
2
3
4
1
3-pin plug
2
Display window (on QBM4100-1D only) for the digital display of the sensor
signal
3
Connection nipples (see "Mounting notes")
4
Sealed safety screw for hinged cover
Mounting and installation notes
The differential pressure sensor is suited for direct mounting on air ducts, walls,
ceilings, or in control panels.
The sensor must be installed vertically.
The supplied 2 meter plastic tubing can be modified to the duct connection on the
plant.
To achieve the housing protective class indicated under "Technical data", the differential pressure sensors must be mounted with the pressure nipple facing down.
In addition, they should be higher than the air duct probes.
Caution
Note
If the pressure connection nipples point upward or are at a lower level than
the air duct probes, condensation can collect inside the sensor, causing
damage to the device.
The pressure tubing for the sensor nipples are connected as following to the differential pressure sensors:
On the air duct side
On the pressure sensor side
Tubing with higher pressure side
(lower vacuum)
Connect to pressure nipple "P1" or "+".
Tubing with lower pressure side
(higher vacuum)
Connect to pressure nipple "P2" or "−".
The sensor is supplied with mounting instructions.
3/6
Siemens
Building Technologies
Differential pressure sensor QBM4000…/ QBM4100…
CE1N1919en01
2014-07-30
Refer to the Manual sensor installation from the BT download center for additional
information.
Caution
• Power supply by SELV or class 2 power supply with limited output of 15 W or
less. (UL requirement)
• Use only copper wiring
Commissioning notes
Caution
Sensor calibration
The values indicated under "Technical data" apply only to vertically mounted differential pressure sensors (connection nipples pointing down).
The sensor is calibrated at the factor in the vertical position. As a consequence, the
sensor must be installed in the vertical position. For horizontal installation (housing cover top or bottom), deviations occur to measured values that negate the
measured values on the certificate.
Disposal
The devices are considered electronics devices for disposal in terms of European
Directive 2012/19/EU and may not be disposed of as domestic waste.
• Dispose of the device via the channels provided for this purpose.
• Comply with all local and currently applicable laws and regulations.
Technical data
Power supply
Safety extra low voltage (SELV/PELV)
or class 2 (UL)
QBM4000-...
3-wire connection
Operating voltage
AC 24 V ± 15 %, 50 / 60 Hz or DC 13.5...33
Power consumption
< 0.5 VA
Current draw
< 10 mA
External supply line protection
Fuse slow max. 10 A
or
Circuit breaker max. 13 A
Characteristic B, C, D according to EN 60898
or
Power source with current limitation of max. 10 A
Output signal
DC 0...10 V, RLast > 10 kΩ (not galvanically
separated, 3-wire connection, short-circuit proof,
protected against reverse polarity)
QBM4000-...
2-wire connection
Operating voltage
for ohm loads up to 500 Ω.
Power consumption
Product data
DC 8...33 V
DC 18…33 V
< 0.7 VA
Current draw
4...20 mA
Output signal
4...20 mA
supply voltage − 8 V
Rload <
[Ω]
0,02 A
2-wire technology, short-circuit proof, protected
against reverse polarity).
Measuring range
refer to "Type summary"
Sensing element
Piezo-resistive (silicone membrane, ceramic bar)
Degree of measuring accuracy at required
(FS = Full Scale)
installation position and room temperature
25 °C.
4/6
Siemens
Building Technologies
Differential pressure sensor QBM4000…/ QBM4100…
CE1N1919en01
2014-07-30
QBM4100-1U
Sum from zero point, linearity, reproducible
and hysteresis.
<±3 % FS (<±3 Pa)
TC zero point
<±0,1 % FS/°C
TC sensitivity
<±0,06 % FS/°C
QBM4000-1
Zero point
<±1.0 % FS
QBM4100-1D
Sum from linearity, reproducible and hysteresis.
<±2 % FS
TC zero point
<±0.1 % FS/°C
TC sensitivity
<±0.06 % FS/°C
QBM4000-3
Zero point
<±0.7 % FS
QBM4000-10
Sum from linearity, reproducible and hystere-
QBM4000-25
sis.
<±1 % FS
TC zero point
<±0.05 % FS/°C
TC sensitivity
<±0.05 % FS/°C
Long-term stability
±1.0% FS as per DIN IEC 60 770
Response time
< 2 0 ms
Load change
<10 Hz
Tolerable overload on one side
on P1.
5,000 Pa
(10,000 Pa for types QBM4000 -10, -25)
At P2
400 Pa
Rupture pressure
at room temperature
2 × overload
at 70 °C
1.5 × overload
Display (QBM4100-1D only)
LCD, 2-line, 8 position each, alphanumeric, not
background lit Display of:
Media
Admissible medium temperature.
Degree of protection
Differential pressure in Pa.
Air and slightly aggressive gases
0...70 °C
Maintenance
Maintenance free
Protection degree of housing at recommended
IP54 according to EN 60529
installation
Connections
Protection class
III according to EN 60730-1
Electrical connections
3-pin round plug with screw terminals 1.5 mm2
(Lumberg RKC 30 / 11)
Pressure connections
PVC nipples ∅ 6.2 mm, under pressure side is
designated as 'P2' or ' – '.
Environmental conditions
Directives, standards
Permissible ambient temperature
Operation
0...70 °C
Transport and storage.
-25...+ 70 °C
Permissible ambient humidity
< 90 % r.h. (without condensation).
Product standard
EN 61326-1
Electrical equipment for measurement, control and laboratory use. EMC requirements.
General requirements
EU Conformity (CE)
CE1T1910xx_01 *)
RCM Conformity
CE1T1910en_C1 *)
UL 60730-1 / UL 60730-2-6
http://ul.com/database
Environmental compatibility
Dimensions (weight)
The product environmental declaration CE1E1916*) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging,
environmental benefit, disposal).
Weight (with packaging)
0.250 kg (with round plug connector).
Weight (with packaging), with display
0.263 kg (with round plug connector).
*) The documents can be downloaded from http://siemens.com/bt/download.
5/6
Siemens
Building Technologies
Differential pressure sensor QBM4000…/ QBM4100…
CE1N1919en01
2014-07-30
Connectors
QBM4000-..
Front view of the plug on the sensor housing (internally wired at the factory) or
the view of the connection side of the cable plug.
Terminal assignment
Operating voltage AC 24 V (SELV) or DC 13.5…33 V.
Output signal DC 0...10 V (reference point M)
GND
QBM4100-1.
Front view of the plug on the sensor housing (internally wired at the factory) or
the view of the connection side of the cable plug.
Terminal assignment
Supply voltage DC 8…33 V.
Output signal DC 4…20 mA.
49
Dimensions
5,5
P2
9,6
16,3
P2
80
92
1919M01
86
18
P2
ø 6,2
P1
11
75
27,6
37
80
Dimensions in mm
6/6
Siemens
Building Technologies
 2005 - 2014 Siemens Switzerland Ltd
Differential pressure sensor QBM4000…/ QBM4100…
Subject to change
CE1N1919en01
2014-07-30